Thanks for your question on Health Care Magic.
I can understand your concern.
Possibility of
gastritis is more in your case.
But since it is left sided
chest discomfort, better to first rule out heart related diseases.
So get done ecg and 2d echo.
If both are normal then no need to worry for cardiac diseases.
Gastritis appears more likely cause for your symptoms.
So avoid
stress and tension. Drink plenty of fluids orally. Start
proton pump inhibitors. Avoid hot and spicy food.
Avoid junk food.
Quit
smoking and alcohol if you have these habits.
Don't worry, you will be alright.
But first rule out heart diseases.
Hope I have solved your query.
Wish you good health. Thanks.